diff --git a/Lib/test/test_email/test_email.py b/Lib/test/test_email/test_email.py
index 8a7e06e..e272f5b 100644
--- a/Lib/test/test_email/test_email.py
+++ b/Lib/test/test_email/test_email.py
@@ -1396,6 +1396,8 @@ List: List-Unsubscribe:
              =?utf-8?q?_to_see_if_line_wrapping_with_encoded_words_and_embedded?=
              =?utf-8?q?_folding_white_space_works?=""")+'\n')
 
+    def test_whitespace_header(self):
+        self.assertEqual(Header(' ').encode(), '')
 
 
 # Test mangling of "From " lines in the body of a message